Q:
      
      
         
            
The line chart given below shows the ratio of production of sales of two bike-manufacturing firms over the period of 6 years.
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Company 1 sold 20000 bikes each year from 2011 to 2016 and company 2 sold 10000 bikes each year from 2011 to 2016. What is the difference (in units) in average yearly production of company 1 and 2?
         
       
      
      
      
          
      
      
      
      
      
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